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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 35, Iss. 22 — Aug. 1, 1996
  • pp: 4502–4509

Vibration measurement by the time-averaged electronic speckle pattern interferometry methods

Wei-Chung Wang, Chi-Hung Hwang, and Shu-Yu Lin  »View Author Affiliations


Applied Optics, Vol. 35, Issue 22, pp. 4502-4509 (1996)
http://dx.doi.org/10.1364/AO.35.004502


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Abstract

Three different image-processing methods based on the time-averaged technique were compared by the electronic speckle pattern interferometry (ESPI) technique for vibration measurement. The three methods are the video-signal-addition method, the video-signal-subtraction method, and the amplitude-fluctuation method. Also, errors introduced by using the zero-order Bessel function directly into the analysis of the fringe pattern were investigated. The video-signal-addition method has been the most generally used ESPI technique for vibration measurement. However, without additional image and/or signal-processing procedures, the fringe pattern obtained directly by the video-signal-addition method is rather difficult to observe. The reason for poor visibility of the experimentally obtained fringe pattern with this method is explained. To increase the fringe pattern’s visibility without additional image and/or signal processes, we tried two video-signal-subtraction methods. One of the two methods is the video-signal-subtraction method that has normally been used in the static applications. The other method, called the amplitude-fluctuation method, and its associated theory are reported here.

© 1996 Optical Society of America

History
Original Manuscript: September 6, 1995
Revised Manuscript: February 5, 1996
Published: August 1, 1996

Citation
Wei-Chung Wang, Chi-Hung Hwang, and Shu-Yu Lin, "Vibration measurement by the time-averaged electronic speckle pattern interferometry methods," Appl. Opt. 35, 4502-4509 (1996)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-35-22-4502


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References

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